Normally you would open Control Panel > Sound > Under Playback and Recording tabs, Select and Set Defaults. Additionally or alternatively, you may also have to try this: Click Start > Type Device Manager in Start Menu Search Bar > Hit Enter.

The Device Manager will open. Expand Sound, Video and Game Controllers. Locate your audio device. Double-click on it to open its Properties box. See whether the driver is installed and the device working properly.

In the Driver tab, click on Update Driver. Click OK. Else you may have to uninstall the Driver (but DONT delete it) and then in the Device Manager > Action > Scan for hardware changes. This will reinstall the driver.

Most Soundcards are now onboard inside the motherboard of your PC. If the sound stopped working after and update it's possible that the new update broke the Drivers you'll need to check your manifrastructurer's website for the newest drivers and reinstall them that usually fixes the problem.

2) Suspension of the System

- Again this can be due to a recent upgrade that asks more resources from your PC in general or you're bleeding resources through some kind of bug or maybe virus. Make sure that your Anti-virus software and firewall are up-to-date and force a full system scan by starting it manually if that turns up clean you can usually rule out most viruses and spyware.

- Press CTRL+ALT+DEL and open the Task Manager see how your resources are managed and if there are high spikes of memory loss and look in the list if any of the currently running programs are doing that.

- In rare occasions your RAM chip(s) could be damaged and RAM doesn't release as fast as it should in that case you'll have to buy new RAM chips and replace them.

3) Spontaneous Shutdowns

Considering point 2) was also an issue this looks like a case of overheating... If you have the software for it check your CPU and GPU temprature and see if it doesn't get to high if it does maybe check if the fans are clean and not obstructed. PC's are build with heat sensitive temperature gauges that will force a shutdown in order not to damage the hardware when a critical temperature is reached.

I hope these pointers help you figuring out what's wrong, it's very hard to diagnose when you can't inspect the system that's being talked about!

@brobushek
If you want any answer that could help, first tell what a computer it is, what is the OP system is there, when it was installed (the last clean installation time), when the computer was last cleaned of dust, grease, etc, especially the fan and the other cooling elements.
It would be nice to know what are the operating temperatures (hard disk, motherboard, CPU, etc)
If you do not give us any information, how can we help you?

You can adjust how long your computer waits before sleeping or hibernating—or prevent it from turning itself OFF ALTOGETHER. But be careful. On a battery powered laptop, inhibiting sleep or hibernation can result in data loss if the battery dies. Here's how to prevent your computer from entering a power-saving state:

Open Power Options by clicking the Start button , clicking Control Panel, clicking System and Security, and then clicking Power Options.

On the Select a power plan page, click Change plan settings next to the selected plan.

On the Change settings for the plan page, click Change advanced power settings.

On the Advanced settings tab, double-click Sleep, double-click Sleep after, and then do one of the following:
If you're using a laptop, click On battery or Plugged in (or both), click the arrow, and then click Never.
If you're using a desktop computer, click Setting, click the arrow, and then click Never.

Double-click Hibernate after, and then do one of the following:
If you're using a laptop, click On battery or Plugged in (or both), click the arrow, and then click Never.
If you're using a desktop computer, click Setting, click the arrow, and then click Never.

If you also want the display to stay turned on, double-click Display, double-click Turn off display after, and then do one of the following:

If you're using a laptop, click On battery or Plugged in (or both), click the arrow, and then click Never.
If you're using a desktop computer, click Setting, click the arrow, and then click Never.
Click OK, and then click Save changes.

I hope that was of some use for you BUT it is a little hard to give Advice and Guidance on what little Information you have given.
Thank you and blessings.

@brobushek
You can adjust how long your computer waits before sleeping or hibernating—or prevent it from turning itself OFF ALTOGETHER. But be careful. On a battery powered laptop, inhibiting sleep or hibernation can result in data loss if the battery dies. Here's how to prevent your computer from entering a power-saving state:

Open Power Options by clicking the Start button , clicking Control Panel, clicking System and Security, and then clicking Power Options.

On the Select a power plan page, click Change plan settings next to the selected plan.

On the Change settings for the plan page, click Change advanced power settings.

On the Advanced settings tab, double-click Sleep, double-click Sleep after, and then do one of the following:
If you're using a laptop, click On battery or Plugged in (or both), click the arrow, and then click Never.
If you're using a desktop computer, click Setting, click the arrow, and then click Never.

Double-click Hibernate after, and then do one of the following:
If you're using a laptop, click On battery or Plugged in (or both), click the arrow, and then click Never.
If you're using a desktop computer, click Setting, click the arrow, and then click Never.

If you also want the display to stay turned on, double-click Display, double-click Turn off display after, and then do one of the following:

If you're using a laptop, click On battery or Plugged in (or both), click the arrow, and then click Never.
If you're using a desktop computer, click Setting, click the arrow, and then click Never.
Click OK, and then click Save changes.

I hope that was of some use for you BUT it is a little hard to give Advice and Guidance on what little Information you have given.
Thank you and blessings.

I'm biased with the sound problem. This could be the one that cause every other ones as I've encountered sound lost when I play with some recording softwares.
My advice for you is to bring your system to the clean slate form, especially the tools that can interfere with your sound drive, don't try to modify and fix it as the problems will get worse.
Like one time I set the sound gate to the speaker (which wasn't plugged in), I opened a youtube page and the whole set shuts, just like that.

try to reboot into safe mode with networking enabled than scan your computer for malware especially with adwcleaner which the best cleaner for malware if your computer shuts down during cleaning it is recommended that you check your ram slots.... do this by disconnecting the power to your computer and clean your ram (the golden pins) with an eraser.. check if that worked out for you

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